Patent DE-102008023197-A1 (DE)
Title: Automatic welding device comprises a welding head and a rotating table for fixing the workpiece to be welded, and a rotating motor for rotating the table and the workpiece around a rotating axis during the welding process
Inventor: STAHNKE MALTE-E
IPC: B23K37/04
Filed: 2008-05-10
Abstract: The automatic welding device comprises a welding head (13) and a rotating table for fixing the workpiece (1) to be welded, a rotating motor for rotating the table and the workpiece around a rotating axis (2) during the welding process, a servo-motor (8, 16) for changing the relative position of the welding head to rotating axis of the rotating table, and a control device for automatically controlling the welding process. The two servo motors are arranged so that a two-dimensional displacement of the relative position of the welding head is guidable to rotational axis of the rotating table. The automatic welding device comprises a welding head (13) and a rotating table for fixing the workpiece (1) to be welded, a rotating motor for rotating the table and the workpiece around a rotating axis (2) during the welding process, a servo-motor (8, 16) for changing the relative position of the welding head to rotating axis of the rotating table, and a control device for automatically controlling the welding process. The two servo motors are arranged so that a two-dimensional displacement of the relative position of the welding head is guidable to rotational axis of the rotating table in radial direction (20) and in tangential direction. A radial motor for displacing is arranged in the radial direction and a tangential motor for displacing is arranged in tangential direction. The radial motor influences on the welding head and the tangential motor influences on the rotating axis of the rotating table and vise versa. The control device is connected with a distance meter that determines an interval between the welding tip of the welding head and the area of the workpiece to be welded. The control device actuates the radial motor in such a way that an interval suitable for the welding process is kept to welding area. The servo-motor or the radial motor stands in connection with position transmitters, which transmit the position data at the control device, from which the momentary rotation interval of the welding tip of the welding head is ascertainable with regard to the rotation axis of the rotating table. The control device determines the tangential relative speed between welding web on the workpiece and welding tip under consideration of the angle speed of the rotating table predetermining the rotating motor and the momentary rotation interval of the first momentary component. The servo-motor actuates in such a way that a second component of the tangential relative speed is produced that adds itself with the first momentary component to a constant welding speed. The servo-motors or the radial motor stands in connection with position transmitters, which transmit position data at the control device from which the momentary rotation interval of the welding tip is ascertainable in such a way that the momentary angle speed of the rotating table is reversibly proportional to the momentary rotation interval. The control device is worked out from changing of the rotation interval dependent upon the rotation axis of the rotating table in the direction of the tangent at the welding web of the workpiece and servo motor or the tangential motor actuates so that a constant welding or constant falling is guaranteed. The radial motor stands in connection with a radial position transmitter, which transmits radial position data to the control device. The momentary rotation interval is determined from the radial position data and the tangential position data under consideration of the angle between the displacing of the radial motor and the displacing of the tangential motors. A turning motor influencing on the welding head is arranged by which a predetermined angle is adjustable between the welding head and the tangent on the welding web at the workpiece.